Always limit of f4 for V1U? at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-V1 / HDR-FX7

Sony HVR-V1 / HDR-FX7
Pro and consumer versions of this Sony 3-CMOS HDV camcorder.


Reply
 
Thread Tools Search this Thread
Old August 18th, 2007, 12:48 AM   #1
Regular Crew
 
Join Date: Jun 2007
Location: Toronto, ON Canada
Posts: 141
Always limit of f4 for V1U?

Hello,
I know it's recommended to use a larger aperture such as F.4 when using small sensor cameras such as the V1U and Z1U, etc. Is there a time when using F.11, for example, would make sense?

I shot some video with my V1U the other day of the exterior of a large downtown hospital. I noticed a fair amount of fringing on the edge of the building against the blue / grey sky. I was shooting at 1/60th with the camera set to auto iris (using ND filter 1 or 2) with the camera iris limit set to F4. I wonder if on really bright days this is too big an opening when wanting to shoot at 1/60th?

Any thoughts on when one should / shouldn't go to F5.4, F11, etc.?

Thanks . . .

Ian
Ian Campbell is offline   Reply With Quote
Old August 18th, 2007, 03:40 AM   #2
Inner Circle
 
Join Date: Aug 2006
Location: Poland
Posts: 4,086
Closing aperture too much will result not so much in fringing (attributable more to contrasty edges), but in diffraction demonstrating itself in image softening (lowering sharpness). Of course, in some circumstances (like extremely bright illumination, lack of additional ND filters, and priority of low shutter speed), you simply MUST close it beyond 5.6 (BTW it's 5.6 or 11, not 4, that you can limit it to in the menu for auto exposure operation).

I'm trying to never exceed 5.6, though - even at the cost of using shutter speeds as high as 1/300th, should need be. The adverse effect of such a fast shutter I checked to be much less serious than that of the iris closing far beyond 5.6 - the latter can make the image really soft!

PS. One of the reasons for closing aperture (apart form light limiting) has always been increasing DOF, but of course with such small chip cameras it's always deep enough - in fact, we're all trying to make it shallower, which again calls for aperture opening as much as possible...
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive

Last edited by Piotr Wozniacki; August 18th, 2007 at 04:24 AM.
Piotr Wozniacki is offline   Reply With Quote
Old August 18th, 2007, 04:48 AM   #3
Trustee
 
Join Date: Jul 2007
Location: Australia
Posts: 1,321
So if i was out shooting at the beach on a bright day and the camera called for f11 and ND filter 2, would i be better off increasing my shutter speed to open my iris to f4 -f5.6
Hope that makes sense.

Could you explain going soft a bit more with a high shutter speed?

Regards
Simon Denny is offline   Reply With Quote
Old August 18th, 2007, 05:00 AM   #4
Inner Circle
 
Join Date: Aug 2006
Location: Poland
Posts: 4,086
Simon,

The short answer to you first question (the bright beach) is yes. Engage ND2 and go up with the shutter speed as required, keeping aperture at mids (around 5.6).

Regarding the second question, I'm afraid you misunderstood: using high shutter speed does NOT cause image softening (closing aperture too much does). The only caveat of high shutter speed is the phenomenon called "strobing", but I really don't find it to spoil my shootings (it's more an aesthetic matter, a one of taste and picture "feel"). Yes, there are some who - due to the CMOS inherent 'rolling shutter" design - claim the 'rolling shutter effect" (slanted verticals with horizontal pans, if too fast) will occur with shutter speeds faster than 1/100th (I'm PAL, for NTSC it would be 1/120th); but again I haven't noticed it to be too pronounced (of course I'm trying to never pan too fast, for other obvious reasons).

Hope this helps.
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive
Piotr Wozniacki is offline   Reply With Quote
Old August 18th, 2007, 05:46 AM   #5
Trustee
 
Join Date: Jul 2007
Location: Australia
Posts: 1,321
Thanks,
Will do some tests and check it out.
Simon Denny is offline   Reply With Quote
Old August 18th, 2007, 10:33 AM   #6
 
Join Date: Jan 2004
Location: Stockton, UT
Posts: 5,648
Without going into all the maths, the upshot is that F4 is ideal for the imager size relationship. If you wanna have a little fun and education at the same time, set up a rez chart and while keeping exposure equal, adjust the iris. You'll see the image start to soften as the aperture closes
__________________
Douglas Spotted Eagle/Spot
Author, producer, composer
Certified Sony Vegas Trainer
http://www.vasst.com
Douglas Spotted Eagle is offline   Reply With Quote
Old August 18th, 2007, 01:45 PM   #7
Inner Circle
 
Join Date: Aug 2006
Location: Poland
Posts: 4,086
Yep, F4 seems to be the "sweet spot" for the aperture on the V1.
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive
Piotr Wozniacki is offline   Reply With Quote
Old August 18th, 2007, 10:10 PM   #8
Regular Crew
 
Join Date: Feb 2007
Location: St. Charles
Posts: 139
Quote:
Originally Posted by Simon Ash View Post
So if i was out shooting at the beach on a bright day and the camera called for f11 and ND filter 2, would i be better off increasing my shutter speed to open my iris to f4 -f5.6
Also, keep some screw on ND filters to add. They are not too expensive.
__________________
Behold, the POWER of cheese!
http://www.321govideo.com
John Huebbe is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-V1 / HDR-FX7

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:44 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network